Kiln.



A J. w. LE GORE,

MLN.' APPLIOATIOH FILED JUNE 22, 1907.

Patented sept. 15,1908.

2 SHEETS-BEBER 1.

@vi hyena:

l i l l.To all whom it may concern.'

UNIFED srarns vrarnivr caricia..

JAMES W. LE GORE, 0F LE GORE, 1itlARYLrID.

KILN. l

Specification of Letters Patent;

'Patented Sept. 15, 1908.

Appli-cation led June 22, 1907. Serial No. 380,296.

Beit known that I, JAMES W. LE GORE, of Le Gore, in the county ofFrederick and State of Maryland, have invented certain new and usefulImprovement-s in Kilns, of which the following is a specification.

This invention relates to structures for calcining lime carbonates andespecially to that form of structure known as per etual flame lime kilnsin which the materia. is calciiied by the intense heat of the flame andhot gases reduced by fires operated in separate chainbers or furnaces sothat no part ofthe fuel or ash is mixed with either the raw or finishedproduct.

The objects of my invention are to provide a kiln that will affect alarge saving in fuel; that. will turn out free of core a superior andregularly bumt product; that will be unequaled for ease of maintenanceand operation; of simple construction so that any of its parts may beeasily and cheaply repaired ane replaced without materiall afectinijrthe other part-s; and which will e capable of large'capacity. Y

o carry out the objects of my invention I utilize the waste heated airfrom the chamber in which the burnt lime is cooling to provide a. meansof draft for the furnaces, and thus avoid the necessity of )reheatingthe air by inea-ns independent of t ie kiln. 'lhe heated air from thecooling mass may be fed to the furnaces in a large enough supply to giveall .the draft needed, or it may be augmented by an additional draftleading from the exterior into and through the fire box so as to preventtlie grate from get-ting too hot.

The invention also comprises a'combustion flue or chamber of suitabledimensions above the furnace which is su flicient to give a thoroughcombustion so that all the gases are consuined before the intenselyheated air ent-ers the burning or caleining chamber. This plan ofcompressing the gases serves to effect a great saving in fuel. Thiscombustion chainber is a source of great economy even when the draft forthe furnace is supplied by cold air, but a much greater saving iseffected when the already heated air from the cooling lime is used. Thedraft may of course be supplied either from air which has been passedthrough the cooling lime, as above described, or when it is desired tosecure more 'current than is practical -to draw through the coolinglime, the air may be drawn from the outside; but the desired amount ofeach current of air can readily be regulated by the use of commondampers adjustable at will by the operator to suit the differentconditionsv of the heat and thel kiln.

Vith the aforesaid objects in view, my invention may be said to consistof the which will be hereinafter more particularly described, in' itspreferable embodiment, illustrated in the accompanying drawings and thenset forth by the claims at the en hereof.

In thedrawings accompanyiiir and form- Referring now to the details ofthe drawings by numerals: 1 represents the structure i which may be madeof any desirable material such as concrete, masonry, etc., and, asillustrated in Fig. 1, there `are shown a battery of three kilns each ofwhich is provided with a. charging opening atthe top and with adischarging opening at the bottoni, these being designated 2 and 3respectivel charge is arran way throu run to carry olf the lime.

' As indicated in Fig. 3 each kiln has an arch-way 5 on opposite sidesin which face the furnaces 7 and 8 and between each pair of kilns, asillustrated in Fie'. 1, there is a assage-way 9 leading eiit-iretlythrough the rihi structure so that an attendant may easily reach thefurnaces on either side for the purpose of feeding or regulating thesame. The interior of the kiln may be of the ordinary structure and isireferably formed of inverted cone shape at die bottom so that as thematerial is burnt it settles at the bottom until a charge of thoroughlyburnt lime is run oil through any form of discharging device which isillustrated diagran'imatically. at 10.

As illustrated in Fig. 3 each of the furnaces ed over a tunne orpassaffeis provided with a [lue or chamber 14 and 15' provided with theusual dampers 22 and 24 The disgh duch .cars or wagons may eioo Y bywhich draft may be supplied from'the exterror whenever desired.

As illustrated 1n Fig. 3 the hot gasesfrom `the furnaces 7 and are notled directly into the kiln chamber but are lcd into combustionchambers'24 andgQG formed in the walls of the kiln and which finallylead into the burning chamber of the kiln at the oints designated 2S and30. By means of trese combustion chambers 2 -1 and 26 there is athorough combustion before any hot gases are permitted to pass into thekiln.

Before proceeding with the description of` the modified forni of myinvention, it may be best to briefly state that although more perfectresults may be obtained by 'using the dampers 18 and 2O and-obtainingthe draft entirely or partially, as the occasion reuires, from the airwhich passes through t e coolinO lime in the inverted cone shaped bottomof the kiln, and while I consider that the method of burnin"r lime byobtaining the draft from the air which passes through the cooling limeas just described, is an essential part of my invention, yet a goodmeasure of success may be obtained by the use of the kiln illustrated inthe'modified fornr of 1n invention shown in Fig. 4 in which the c raftis supplied entirely from the exterior through the dampers in theashits. P In the operation of my kiln, after the furnaces are startedand the first charge of lime is drawn ofi', the succeeding chargessettle into the inverted cone shaped bottom and are permitted to staythere, before being drawn off, luntil cooled. Duringthe cooling, theheat which is naturally lost, is led from the coolinfr mass through theflues 14 and 15 into the asth-pits of the furnaces 7 and 8, the

'amount of draft being. controlled by the dampers 18 andy 20. The airfed to the furnaces is thus effectuallyheat-ed and if the heat is toointense at the time when the mass is first cooling ofi' a further supplyof air may -be drawn from the exterior solas to prevent any burning ofthe grates and the dampers may be regulated to produce the best resultsby using either preheated draft alone, or the exterior draft alone, orboth together. And

owing to the combustion chambers 24 and i 26, the fuel 1s thoroughlyconsumed before 1t is passed into the burning chamber. It will bereadily seen that by supplying hot air for the draft, the rapidgeneration of all the gases contained in the fuel is greatly increasedso that thorough combustion is more readily produced in the combustionchamber before 'reaching the producttobe heated in the calciningchamber. The combustion chambers have the further func-tion ofpreventing any direct cold or unheated air from entering the kiln anddeteriorating the product. By utilizing the hot air for the fires orfurnaces and having all the gases passing from the furnaces through thecombustion chamber, I

gases from the fuel consumed.

combustion chamber located within the wall of the kilnis that by makingthis chamber'of the proper length, I obtain the. proper amount ofspate'for the curing, soaking, and finishing calcining the limethoroughly befonv it reaches the part of the kiln where it is cooled,and thus I )revcnt any core from passing through the ltiln.

It is obvious that changes may be made in the form of my kiln and in thefurnaces and combustion chambers and I do not limit myself to anyspecial .construction or any particular material but refer to theappended claims to )oint out the scope of my invention.

lVhat claim as new is:

1. The method of burning lime or other material which consists inleading all the gases from the furnaces through a combustion chamber inthe walls of the kiln of sufficient dimension to insure )racticallycomplete couibustion and to aflord room within the burning chamber-ofthe kiln for the proper curing and caleining of the lime.

2. The method of burning lime or other material which consists inleading the heated air from the cooling chamber through the nacesthrough a combustion chamber in the walls of the kiln of sufficientdimension to insure practically complete combustion and to afford roomwithin the burning chamber of the kiln for the proper curing andcalcining of the lime, whereby as the lime is cooled in the lower partof the kiln heated air is drawn therefrom and led into the furnace andthen into the kiln at a height to afford combustion and form a space forthe burning and calcining of the lime.

3. A kiln comprising a burning chamber, a cooling chamber at the bottomthereof, a discharge chamber under said cooling chamber, a furnace, anda flue or passageway leading directly from the cooling chamber to thefurnace, whereby air is drawn directly through the cooling lime and usedfor the draft and dampers controlling the said flue or passageway fromthe cooling chamber to the furnace, and said kiln also having a chamberl above the cooling chamber of sufficient dimension to insure the propercuring and calcining of the lime.

4. A kiln comprising a burning chamber, a cooling chamber at the bottomthereof, a discharge chamber under said cooling chamber, a furnace, anda flue or'passage-way leading directly from the cooling chamber tothe-furnace, whereby air is drawn directly through the cooling lime andused for the drafthand a combustion chamber in the wall of the kiln ofsufficient dimension to insure practically' complete combustion and toform a burning obtain the full power and benefit of' allthe Y Anotheradvantage due to the use of the furnaces, leading all the gases from thefur- 'chamber between the entrance,`A of the coming a chamber below theentrance of the coxnf bustion chamber into the kiln and the aforebustionchamber in the kiln to permit the said cooling chamber and saidcombustion burnt materlal to thoroughly calcule' before chamberconducting all the gases to the burnbeing cooled.

V5 ing chamber. Signed by me at Vashi-igton, D. C. thi:` 15

5. In a kiln, a burning chamber, an ex- 19th day of June 1907.

. teror furnace, and a combustion chamber JAMES W'. LE GORE.

between said furnace and said burning Witnesses: ,l chamber of suiicientdimension to insure HENDERSON F. HILL',

10 practically complete combustion and form-A H. S. IMIRIE.

